POLUS GSM* Safeguards and protects when doors and windows* Places a phone call and sends text message to your phone* Arms via a keychain magnet or an optional hardwired switch* Disarms via an incoming telephone call registered phone* Operates in temperature range of 14-122 °F (-10/+50 ℃)* Option to input hardwire an external sensor loop* Operates on a single battery for up to one year* Compact sizeLearn More